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CN109882880B - High-temperature flue gas cooling method and device for preventing dioxin from being synthesized again - Google Patents

High-temperature flue gas cooling method and device for preventing dioxin from being synthesized again Download PDF

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Publication number
CN109882880B
CN109882880B CN201910197188.6A CN201910197188A CN109882880B CN 109882880 B CN109882880 B CN 109882880B CN 201910197188 A CN201910197188 A CN 201910197188A CN 109882880 B CN109882880 B CN 109882880B
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China
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water
cooling
box
flue gas
air
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CN201910197188.6A
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CN109882880A (en
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刘建文
章国伟
王俊虎
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Beijing Jointech Electro Hydraulic Co ltd
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Beijing Jointech Electro Hydraulic Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

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  • Chimneys And Flues (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a high-temperature flue gas cooling method and device for preventing dioxin from being synthesized again. The beneficial effects are that: according to the invention, through the air cooling box, the water cooling box and the spraying box, the temperature of the flue gas is quickly reduced to about 50 ℃ within one second, the resynthesis of dioxin is avoided, the environmental pollution is avoided, meanwhile, the water content of the sprayed flue gas is greatly reduced, the water consumption is reduced, the heat in the high-temperature flue gas is recycled through arranging the heat exchange copper pipe in the air cooling box, the air entering the pyrolysis furnace from the outside is preheated, the temperature of the air is increased, the pyrolysis efficiency of garbage is further improved, and the spray water can be collected through the arranged first water outlet pipe, the second water outlet pipe and the water storage elbow, so that the consumption of water resources is reduced.

Description

High-temperature flue gas cooling method and device for preventing dioxin from being synthesized again
Technical Field
The invention relates to the technical field of high-temperature flue gas cooling, in particular to a high-temperature flue gas cooling method and device for preventing dioxin from being synthesized again.
Background
In the process of utilizing the pyrolysis furnace to carry out the treatment to domestic waste, in order to prevent high temperature flue gas pollution environment, often need carry out cooling to high temperature flue gas, however, current high temperature flue gas cooling device mainly adopts the mode of spraying to carry out cooling treatment to high temperature flue gas, cooling rate is slower, the water consumption is big, and can produce dioxin again in the cooling process, pollute the environment, and lack the device that preheats outside air on it, can not realize the recycle of heat in the high temperature flue gas, and can often reduce the pyrolysis efficiency of rubbish because of entering into the air temperature in the pyrolysis furnace for the garbage treatment too low, still lack water collecting device on it for spray water can not get in time to collect, cause the water resource waste, therefore the high temperature flue gas cooling device that prevents dioxin and synthesize again is urgently needed to solve current problem.
Disclosure of Invention
The invention aims to solve the problems and provide a high-temperature flue gas cooling method and a device for preventing the re-synthesis of dioxin.
The invention realizes the above purpose through the following technical scheme:
The high-temperature flue gas cooling device for preventing the re-synthesis of dioxin comprises an air cooling box, a water cooling box and a spray box, wherein an air cooling box peripheral plate is arranged on the periphery of the air cooling box, a flue gas inlet pipe is arranged on one side of the bottom end of the air cooling box, a temperature sensor mounting pipe I is arranged on one side wall of the air cooling box, a connecting flange I is arranged on one side of the temperature sensor mounting pipe I, an air collecting cover is arranged on one side of the connecting flange I, hot air outlet pipes are arranged in the middle of the bottom end of the air collecting cover, heat exchange copper pipes are transversely distributed in the air cooling box in a staggered mode, a temperature sensor mounting pipe II is arranged on one side of the upper end of the air cooling box, a connecting flange II is arranged on one side of the air cooling box, a water cooling box peripheral plate is arranged on the periphery of the water cooling box, a connecting flange III is arranged on the water cooling box close to the connecting flange II, a cooling water inlet pipe is arranged on one side wall of the water cooling tank, a cooling water outlet pipe is arranged on one side of the upper end of the water cooling tank, water baffles are distributed on the inner wall of the water cooling tank in a staggered manner, heat exchange stainless steel pipes are arranged on the water baffles, a connecting flange IV is arranged at one end of the water cooling tank, a spray tank is arranged on one side of the water cooling tank, a spray tank peripheral plate is arranged on the periphery of the spray tank, a connecting flange V is arranged on the spray tank and close to the connecting flange everywhere, a cleaning cover plate is arranged in the middle of the upper end of the spray tank, a water trap head is arranged in the middle of the bottom end of the spray tank, a water outlet pipe II is arranged at the bottom end of the water trap head, a smoke outlet pipe is arranged on one side of the water trap head, a sensor mounting port is arranged in the middle of one side wall of the spray tank, a smoke baffle is arranged in the spray tank, the flue gas baffle has at least two, be provided with the water spray pipe of lattice formula between the flue gas baffle, flue gas baffle one side is provided with water vapor separator, spray case bottom is provided with outlet pipe one.
Further, the number of the flue gas baffles is two, three, four, five and the like, and from the viewpoints of cooling treatment effect and cost for high-temperature flue gas, 3-4 are preferable.
Further, the number of the air cooling box peripheral plates, the spraying box peripheral plates and the water cooling box peripheral plates is six, and the air cooling box peripheral plates, the spraying box peripheral plates and the water cooling box peripheral plates are all made of stainless steel plates.
Furthermore, the flue gas inlet pipe is welded with the air cooling box, the first connecting flange is connected with the air cooling box and the air collecting hood through bolts, and the hot air outlet pipe is welded with the air collecting hood.
Furthermore, the first temperature sensor mounting pipe and the second temperature sensor mounting pipe are connected with the air cooling box in an inserting mode, and the heat exchange copper pipe is connected with the air cooling box in an inserting mode.
Furthermore, the second connecting flange is connected with the air cooling box in an inserting mode, the third connecting flange and the fourth connecting flange are connected with the water cooling box in an inserting mode, the air cooling box is connected with the water cooling box through the second connecting flange and the third connecting flange, and the spraying box is connected with the water cooling box through the fourth connecting flange and the fifth connecting flange.
Furthermore, the cooling water inlet pipe and the cooling water outlet pipe are both in plug-in welding with the water cooling box, the water baffle is welded with the water cooling box, and the heat exchange stainless steel pipe is in plug-in welding with the water baffle.
Further, the cleaning cover plates are connected with the spray box through bolts, and the number of the cleaning cover plates is two.
Further, the flue gas baffle plate is welded with the spray box, the water spray pipe is connected with the spray box through a pipe hoop, the water-vapor separator is connected with the spray box through bolts, and the number of the water-vapor separators is two.
Further, the sensor mounting port is formed in the spray box, the smoke outlet pipe and the first water outlet pipe are connected with the spray box in an inserting mode, and the water storage elbow is connected with the first water outlet pipe and the second water outlet pipe in an inserting mode.
The invention has the beneficial effects that:
1. In order to solve the problems that the existing high-temperature flue gas cooling device mainly adopts a spraying mode to cool high-temperature flue gas, the cooling speed is low, the water consumption is high, dioxin can be generated again in the cooling process, and the environment is polluted, the temperature of the flue gas is quickly reduced to about 50 ℃ in one second through the air cooling box, the water cooling box and the spraying box, the resynthesis of the dioxin is avoided, the environmental pollution is avoided, the water content of the sprayed flue gas is greatly reduced, and the water consumption is reduced;
2. in order to solve the problems that the prior high-temperature flue gas cooling device lacks a device for preheating external air, so that the recycling of heat in high-temperature flue gas cannot be realized, and the pyrolysis efficiency of garbage is often reduced due to the fact that the temperature of air entering a pyrolysis furnace for garbage treatment is too low, the heat exchange copper pipe is arranged in the air cooling box, so that the heat in the high-temperature flue gas is recycled, the air entering the pyrolysis furnace from the outside is preheated, the temperature of the air is increased, and the pyrolysis efficiency of garbage is further improved;
3. In order to solve the problems that the existing high-temperature flue gas cooling device lacks a water collecting device, so that spray water cannot be collected in time and water resources are wasted, the spray water can be collected through the first water outlet pipe, the second water outlet pipe and the water storage elbow, and consumption of water resources is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature flue gas cooling device for preventing dioxin from being synthesized again.
The reference numerals are explained as follows:
1. An air cooling box; 1.1, an air cooling box peripheral plate; 1.2, a flue gas inlet pipe; 1.3, a first temperature sensor mounting pipe; 1.4, heat exchange copper pipe; 1.5, an air collecting hood; 1.6, a hot air outlet pipe; 1.7, connecting a first flange; 1.8, a second temperature sensor mounting pipe; 1.9, connecting a second flange; 2. a water cooling tank; 2.1, a connecting flange III; 2.2, a cooling water outlet pipe; 2.3, a water cooling box peripheral plate; 2.4, heat exchanging stainless steel tube; 2.5, a water baffle; 2.6, a cooling water inlet pipe; 2.7, a connecting flange IV; 3. a spray box; 3.1, connecting a flange; 3.2, a peripheral plate of the spray box; 3.3, cleaning the cover plate; 3.4, a water spray pipe; 3.5, a smoke baffle; 3.6, a water-vapor separator; 3.7, a sensor mounting port; 3.8, a smoke outlet pipe; 3.9, a first water outlet pipe; 3.10, a water trap; and 3.11, a second water outlet pipe.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
As shown in figure 1, the high-temperature flue gas cooling device for preventing the re-synthesis of dioxin comprises an air cooling box 1, a water cooling box 2 and a spray box 3, wherein an air cooling box peripheral plate 1.1 is arranged on the periphery of the air cooling box 1, a flue gas inlet pipe 1.2 is arranged at one side of the bottom end of the air cooling box 1, a temperature sensor mounting pipe 1.3 is arranged on one side wall of the air cooling box 1, a connecting flange 1.7 is arranged at one side of the temperature sensor mounting pipe 1.3, an air collecting hood 1.5 is arranged at one side of the connecting flange 1.7, the air collecting hood 1.5 can be connected with the air cooling box 1 through the connecting flange 1.7 so as to realize the collection of external air after heat exchange, a hot air outlet pipe 1.6 is arranged at the middle part of the bottom end of the air collecting hood 1.5, the external air after heat exchange can be fed into a reaction hearth of a garbage treatment device through the hot air outlet pipe 1.6, the inside of the air cooling box 1 is transversely and alternately distributed with heat exchange copper pipes 1.4, one side of the upper end of the air cooling box 1 is provided with a temperature sensor mounting pipe II 1.8, one end of the air cooling box 1 is provided with a connecting flange II 1.9, one side of the air cooling box 1 is provided with a water cooling box 2, the periphery of the water cooling box 2 is provided with a water cooling box peripheral plate 2.3, the water cooling box 2 is provided with a connecting flange III 2.1 near the connecting flange II 1.9, one side wall of the water cooling box 2 is provided with a cooling water inlet pipe 2.6, one side of the upper end of the water cooling box 2 is provided with a cooling water outlet pipe 2.2, the inner wall of the water cooling box 2 is alternately distributed with a water baffle 2.5, the water baffle 2.5 is provided with a heat exchange spray stainless steel pipe 2.4, one end of the water cooling box 2 is provided with a connecting flange IV 2.7, one side of the water cooling box 2 is provided with a water cooling box 3, the periphery of the spray box 3 is provided with a box peripheral plate 3.2, the utility model discloses a water-saving shower device, including shower box 3, gas baffle 3.5 has at least two, be provided with water spray pipe 3.4 of lattice type between gas baffle 3.5, gas baffle 3.5 one side is provided with separator 3.6, gas baffle 3 bottom is provided with outlet pipe 3.9, gas baffle 3.5 one side is provided with outlet pipe 3.8, gas baffle 3.10 one side is provided with sensor mounting port 3.7, sensor mounting port 3.7 department mountable outside humidity transducer to measure the humidity of flue gas after the catch water, be provided with gas baffle 3.5 in the shower box 3.
In this embodiment, the number of the flue gas baffles 3.5 is two, three, four, five, etc., and preferably 3 to 4 from the viewpoints of cooling and cooling effects on high-temperature flue gas and cost.
In this embodiment, the number of air cooling case peripheral board 1.1 spray case peripheral board 3.2 and water-cooling case peripheral board 2.3 is six, air cooling case peripheral board 1.1 spray case peripheral board 3.2 and water-cooling case peripheral board 2.3 all adopt the corrosion resistant plate to make, through six air cooling case peripheral board 1.1 make form the passageway that the flue gas flowed through in the air cooling case 1, through six spray case peripheral board 3.2 make form the passageway that the flue gas flowed through in the water-cooling case 2, through six water-cooling case peripheral board 2.3 make form the passageway that the flue gas flowed through in the spray case 3 to handle high temperature flue gas in proper order.
In this embodiment, flue gas inlet tube 1.2 with air cooling case 1 welding, flange 1.7 with air cooling case 1 and air gas collecting channel 1.5 all pass through bolted connection, hot air outlet duct 1.6 with air gas collecting channel 1.5 welding makes through bolted connection's connected mode flange 1.7 with it is more convenient that dismantle between air cooling case 1 and the air gas collecting channel 1.5, the later stage of being convenient for overhauls and maintains.
In this embodiment, the first temperature sensor mounting pipe 1.3 and the second temperature sensor mounting pipe 1.8 are both inserted into the air cooling box 1, the heat exchange copper pipe 1.4 is inserted into the air cooling box 1, and external air can flow through the heat exchange copper pipe 1.4, so as to perform heat exchange with high-temperature flue gas in the device, thereby realizing air cooling operation of the device.
In this embodiment, flange two 1.9 with air cooling case 1 pegging graft, flange three 2.1 and flange four 2.7 all with water-cooling case 2 pegging graft, air cooling case 1 with water-cooling case 2 pass through flange two 1.9 with flange three 2.1 links to each other, spray case 3 with water-cooling case 2 passes through flange four 2.7 and flange five 3.1 link to each other, make through the connected mode of flange water-cooling case 2 air-cooling case 1 with assemble between the spray case 3 more convenient.
In this embodiment, the cooling water inlet pipe 2.6 and the cooling water outlet pipe 2.2 are both welded with the water cooling tank 2 in an inserting manner, the water baffle 2.5 is welded with the water cooling tank 2, the heat exchange stainless steel pipe 2.4 is inserted with the water baffle 2.5 in an inserting manner, and due to the design of the water baffle 2.5, water in the water cooling tank 2 flows in a serpentine manner up and down outside the heat exchange stainless steel pipe 2.4, the contact area of cooling water and the heat exchange stainless steel pipe 2.4 is increased, and the heat transfer efficiency under the turbulent flow state of cooling water and the heat exchange efficiency of the heat exchange stainless steel pipe 2.4 are improved.
In this embodiment, wash apron 3.3 with spray box 3 passes through bolted connection, the quantity of wasing apron 3.3 is two, through wash apron 3.3 detachable design, make spray box 3 inside washs more convenient.
In this embodiment, the flue gas baffle 3.5 with spray box 3 welding, water spray pipe 3.4 with spray box 3 passes through the ferrule and links to each other, water vapor separator 3.6 with spray box 3 passes through bolted connection, water vapor separator 3.6 has two, through 3-4 the design of flue gas baffle 3.5 for the flue gas is the serpentine flow and passes spray box 3 is inside, with ensure flue gas with the abundant contact of the water that spouts in the water spray pipe 3.4.
In this embodiment, the sensor mounting port 3.7 is formed on the spray box 3, the smoke outlet pipe 3.8 and the water outlet pipe one 3.9 are both inserted into the spray box 3, the water storage elbow 3.10 is inserted into the water outlet pipe one 3.9 and the water outlet pipe two 3.11, and the water storage elbow 3.10, the water outlet pipe one 3.9 and the water outlet pipe two 3.11 are designed so that water after spraying, cooling and water-vapor separation can be discharged in time.
The application method of the high-temperature flue gas cooling device for preventing the re-synthesis of dioxin comprises the following steps: when in use, firstly, an external temperature sensor is arranged on the first temperature sensor mounting pipe 1.3 and the second temperature sensor mounting pipe 1.8 so as to realize the monitoring of the temperature change of flue gas, an external cooling water pipeline is connected with the cooling water inlet pipe 2.6, then the flue gas inlet pipe 1.2 is connected with an external flue gas discharge pipeline, the hot air outlet pipe 1.6 is connected with an air supply pipeline in an external garbage treatment reaction furnace chamber, then the water-vapor separator 3.6 is opened, the device can work, high-temperature flue gas with the temperature higher than 850 ℃ outside enters a channel in the air cooling box 1 from the flue gas inlet pipe 1.2, then flows outside the heat exchange copper pipes 1.4 which are transversely staggered in the air cooling box 1, and meanwhile, external air flows in the heat exchange copper pipes 1.4 after entering from the opposite side of the air collecting hood 1.5 through a certain measure, during the period, heat exchange is carried out on the high-temperature flue gas outside the heat exchange copper pipe 1.4, the external air heated after heat exchange is collected into the hot air outlet pipe 1.6 under the action of the air collecting hood 1.5, so that the external air after heat exchange is sent into the garbage treatment reaction hearth to supply oxygen, the high-temperature flue gas after cooling can enter the water cooling box 2, the high-temperature flue gas can circulate in the heat exchange stainless steel pipe 2.4 after entering the water cooling box 2, cooling water enters the water cooling box 2.6 through the cooling water inlet pipe 2.6 on the water cooling box 2, flows in a serpentine manner up and down outside the heat exchange stainless steel pipe 2.4 under the action of the water baffle plate 2.5 and finally flows out through the cooling water outlet, the heat exchange with the flue gas is completed during the period, the primary cooling of the flue gas is realized, the flue gas after cooling finally enters the spray box 3, the flue gas flows in a serpentine manner up and down under the action of the flue gas baffle 3.5, the number of the flue gas baffle 3.5 can be set according to actual needs, in the process, spray water is fully contacted with the flue gas under the action of a spray head arranged on the water spray pipe 3.4, the flue gas is rapidly reduced to below 50 ℃ within 1s, dust in the flue gas is washed, the treated flue gas can pass through the water-vapor separator 3.6, water vapor in the flue gas can be separated under the action of the water-vapor separator 3.6, finally, the low-temperature, clean and dry flue gas is discharged through a flue outlet, the spray water is deposited to the bottom of the spray box 3, and the spray water is collected by a plurality of water outlet pipes I3.9 and water storage elbow 3.10 and then discharged through water outlet pipes II 3.11.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A high-temperature flue gas cooling device for preventing the re-synthesis of dioxin is characterized in that: including air cooling case (1), water-cooling case (2) and spray case (3), air cooling case (1) periphery is provided with air cooling case peripheral board (1.1), air cooling case (1) bottom one side is provided with flue gas inlet tube (1.2), be provided with temperature sensor mounting tube (1.3) on a lateral wall of air cooling case (1), temperature sensor mounting tube one (1.3) one side is provided with flange one (1.7), flange one (1.7) one side is provided with air gas collecting channel (1.5), air gas collecting channel (1.5) bottom middle part is provided with hot air outlet duct (1.6), be horizontal staggered distribution in air cooling case (1) and have heat exchange copper pipe (1.4), air cooling case (1) upper end one side is provided with temperature sensor mounting tube two (1.8), air cooling case (1) one end is provided with flange two (1.9), air cooling case (1) one side is provided with water cooling case (2), water cooling case (2) one side is provided with air collecting channel (2) bottom end middle part is provided with hot air cooling case outlet tube (1.6), be provided with water cooling case (2.2) top water cooling case (2) top one side is provided with water cooling case (2.2) top water cooling case (2), a water baffle (2.5) is distributed on the inner wall of the water cooling box (2) in a staggered manner, a heat exchange stainless steel pipe (2.4) is arranged on the water baffle (2.5), a connecting flange IV (2.7) is arranged at one end of the water cooling box (2), a spraying box (3) is arranged on one side of the water cooling box (2), a spraying box peripheral plate (3.2) is arranged on the periphery of the spraying box (3), a connecting flange V (3.1) is arranged on the spraying box (3) close to the connecting flange IV (2.7), the connecting flange II (1.9) is spliced with the air cooling box (1), the connecting flange III (2.1) and the connecting flange IV (2.7) are spliced with the water cooling box (2), the air cooling box (1) is connected with the water cooling box (2) through the connecting flange II (1.9) and the connecting flange III (2.1), and the spraying box (3) is connected with the water cooling box (2) through the connecting flange IV (2.7);
The middle part of the upper end of the spray box (3) is provided with a cleaning cover plate (3.3), the cleaning cover plate (3.3) is connected with the spray box (3) through bolts, and the number of the cleaning cover plates (3.3) is two; the water storage device is characterized in that a water storage elbow (3.10) is arranged in the middle of the bottom end of the spray box (3), a water outlet pipe II (3.11) is arranged at the bottom end of the water storage elbow (3.10), a smoke outlet pipe (3.8) is arranged on one side of the water storage elbow (3.10), a sensor mounting port (3.7) is arranged in the middle of one side wall of the spray box (3), at least two smoke baffles (3.5) are arranged in the spray box (3), a dot matrix type water spray pipe (3.4) is arranged between the smoke baffles (3.5), a water-steam separator (3.6) is arranged on one side of the smoke baffles (3.5), and a water outlet pipe I (3.9) is arranged at the bottom end of the spray box (3); the smoke outlet pipe (3.8) and the first water outlet pipe (3.9) are both connected with the spray box (3) in an inserting mode, and the water storage elbow (3.10) is connected with the first water outlet pipe (3.9) and the second water outlet pipe (3.11) in an inserting mode.
2. The high temperature flue gas cooling device for preventing the re-synthesis of dioxin according to claim 1, wherein: the air cooling box peripheral board (1.1) spray box peripheral board (3.2) and the quantity of water-cooling box peripheral board (2.3) are six, air cooling box peripheral board (1.1) spray box peripheral board (3.2) and water-cooling box peripheral board (2.3) all adopt corrosion resistant plate to make.
3. The high temperature flue gas cooling device for preventing the re-synthesis of dioxin according to claim 1, wherein: the flue gas inlet pipe (1.2) with air cooling case (1) welding, flange one (1.7) with air cooling case (1) and air gas collecting channel (1.5) all pass through bolted connection, hot air outlet duct (1.6) with air gas collecting channel (1.5) welding.
4. The high temperature flue gas cooling device for preventing the re-synthesis of dioxin according to claim 1, wherein: the first temperature sensor mounting pipe (1.3) and the second temperature sensor mounting pipe (1.8) are both connected with the air cooling box (1) in an inserting mode, and the heat exchange copper pipe (1.4) is connected with the air cooling box (1) in an inserting mode.
5. The high temperature flue gas cooling device for preventing the re-synthesis of dioxin according to claim 1, wherein: the cooling water inlet pipe (2.6) and the cooling water outlet pipe (2.2) are welded after being spliced with the water cooling tank (2), the water baffle (2.5) is welded with the water cooling tank (2), and the heat exchange stainless steel pipe (2.4) is spliced with the water baffle (2.5).
6. The high temperature flue gas cooling device for preventing the re-synthesis of dioxin according to claim 1, wherein: the flue gas baffle (3.5) with spray box (3) welding, water spray pipe (3.4) with spray box (3) pass through the ferrule and link to each other, vapour separator (3.6) with spray box (3) pass through bolted connection, vapour separator (3.6) have two.
7. A method for using a high-temperature flue gas cooling device for preventing the re-synthesis of dioxin, which is applied to the high-temperature flue gas cooling device for preventing the re-synthesis of dioxin, according to any one of claims 1 to 6, and is characterized in that: when in use, an external temperature sensor is arranged on the first temperature sensor installation pipe (1.3) and the second temperature sensor installation pipe (1.8) so as to realize monitoring of flue gas temperature change, an external cooling water pipeline is connected with the cooling water inlet pipe (2.6), then the flue gas inlet pipe (1.2) is connected with an external flue gas discharge pipeline, the hot air outlet pipe (1.6) is connected with an air supply pipeline in an external garbage treatment reaction furnace chamber, then the water-steam separator (3.6) is opened, so that the device can work, and external high-temperature flue gas with the temperature of above 850 ℃ enters a channel in the air cooling box (1) through the flue gas inlet pipe (1.2), the high-temperature flue gas flows through the outer sides of the heat exchange copper pipes (1.4) transversely staggered in the air cooling box (1), meanwhile, the external air enters from the opposite sides of the air collecting hood (1.5) and flows in the heat exchange copper pipes (1.4) through certain measures, during the heat exchange with the high-temperature flue gas outside the heat exchange copper pipes (1.4), the external air heated after the heat exchange is collected into the hot air outlet pipe (1.6) under the action of the air collecting hood (1.5), so that the external air after the heat exchange is fed into the garbage treatment reaction hearth for oxygen supply, the cooled high-temperature flue gas enters into the water cooling box (2), the high-temperature flue gas enters into the water cooling box (2) and circulates in the heat exchange stainless steel pipes (2.4), cooling water enters through a cooling water inlet pipe (2.6) on a water cooling tank (2), the cooling water flows through a cooling water outlet in a serpentine manner from top to bottom under the action of a water baffle (2.5) on the outer side of a heat exchange stainless steel pipe (2.4), heat exchange with smoke is completed in the process, the smoke after cooling is finally fed into a spray tank (3), the smoke flows in a serpentine manner from top to bottom under the action of the smoke baffle (3.5), the quantity of the smoke baffle (3.5) can be set according to actual needs, in the process, spray water is in full contact with the smoke under the action of a spray head arranged on a water spray pipe (3.4), the temperature of the smoke is rapidly reduced to below 50 ℃ within 1s, dust in the smoke is washed, the smoke after treatment can pass through a separator (3.6), the smoke after the treatment can be separated out under the action of the separator (3.6), the smoke in the smoke can be finally separated into low-temperature smoke, the smoke after the drying can be dried, and the smoke can be discharged through a plurality of spray heads (3.10) and the water-steam is discharged through a water outlet pipe (3.11) and the bottom of the spray head (3.11).
CN201910197188.6A 2019-03-15 2019-03-15 High-temperature flue gas cooling method and device for preventing dioxin from being synthesized again Active CN109882880B (en)

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